Considering the fact that tomorrow's patch will (hopefully) bring back sagas for good, I suggest that a few more be added soon:
1) The Storyline saga
This one would consist of Waterworks, Shan-to-Kor series (with Shaagh's helm) and end with Tempest's Spine. Maybe more people would start realizing that these quests are all related and eventually lead to the Gianthold quests.
2) The Masters Saga
This would consist of the Threnal series and the Delera series.
3) The Unforgiving
This saga would have Faithful Departed, Proof is in the Poison, the fire elemental quest in house K, the sequel quest to VoN 4 (haywire pt 2), the optional quest from the Deneith Sentinels line, The Pit, and the trials quest out in 3BC. *dons fireproof suit*
4) Death of a Wannabe God
This would be *all* of the Necropolis quests.
5) Yes, I'm flagged
This would be all the Titan and DQ raid flag quests, and completing this saga means you do not have to run the flag quests for DQ again and also do not have to "unbreak" the medallion for the Titan. (Yes this one is in jest, but only partially)
Feel free to submit your new saga requests here as well!